Teeeitoey



(No Model.)

' A. L. DAWSON.

LAMP.

No. 289,510. Patented-Dec. 4, 1883.

wi 7268888, 'J/wenor:

UNITED STATES PATENT OFFICE.

ARTEMAS LORD DAWVSON, OF ELK POINT, DAKOTA TERRITORY, ASSIGN OR OF ONE-HALF TO CHARLES H. FREEMAN, OF SAME PLACE.

LAMP.

SPECIFICATION forming part of Letters Patent No. 289,510, dated December 4, 1888,

Application filed April 30, 1883. (No model.)

To aZZ whom, it may concern:

Be it known that I, ARTEMAS L. Dawson,

of Elk Point, in the county of Union and Ten ritory of Dakota, have invented certain new and useful Improvements in Lamps; and I hereby declare the following to be a full, clear, and exact description of the same.

' My invention relates to improvements in the construction and mode of attachment of the metal collar employed with all lamps, whether formed of glass, porcelain, or other Ware, to allow the attaching of the burner, which is screwed into this collar.

Heretofore the common practice, in attaching the collar, has been to mold the body with a vertical neck or rim around the orifice in the top and to fit the collar over this neck, securing it in place thereto by a suitable cement. The above construction involves considerable difficulty and expense in the molding of the lamp-body, and it is not durable, the collars, when thus attached, having a tendency to become loose.

My object is to overcome this defect; and to this end my invention consists, first, in forming the lamp-body without the rim or neck referred to around the top orifice, and making the collar in the form of an internallyscrew-threaded tube passing through the orifice, and provided with a flange or rim at its upper end, in one piece with the tube, to rest on the outer surface of the top of the lampbody, around the orifice, the lower end of the tubebeing turned outward and upward against the inner surface of the top to form a retaining-flange, and the whole being applied direct- 1y to the lamp-body.

My invention consists, also, in combining with the foregoing features one or more small projections molded upon the outer surface of the lamp-body, around the orifice, and forming corresponding depressions in the under surface of the upper flange of the collar to receive the said projections, whereby the collar is prevented from turning in its seat, even though great force be used in screwing and unscrewing the burner.

In the drawings, Figure 1 is a side elevation, partly in section, of a. lamp provided with my improvements; and Fig. 2, a perspective view of the collar before being attached.

A is the body of the lamp, which is generally molded from glass, though it is sometimes formed of earthenware. In the top is the usual circular orifice, which, however, is formed without the usual rim or neck.

B is the collar, comprising, first, the tube o, screw-threaded on its interior, and having an exterior diameter equal to the diameter of the circularorifice in the lamp-body; and, secondly, the flange u, to rest against the outer surface of the lamp-body when the tube is passed through the orifice. The length of the tube 1: is such that when it is placed in position within the orifice the lower end will extend inward a short distance beyond the lower edge of the orifice. The lower end of the tube is then turned upward closely against the inner surface of the lamp-body, in the form of a flange, t, a suitable tool or machine being used for this purpose. The collar B is ordinarily formed of brass, though any other suitable metal may be employed. In practice I turn up the lower end of the tube, to form the flange t, by means of a machine especially adapted to the purpose. In applying this machine the blades which operate to turn up the flange t revolve at a great speed, burnishing and hardening the metal, and causing it to fit everywhere with the utmost exactness to the inner surface. The machine will form the subject of a separate patent. Although the collar fits with great firmness when applied in the manner above described simply to smooth surfaces, provision may, if desired, be made against its turning in its seat when the burner is screwed in or out. The device as represented in the drawings shows such a provision. One or more small projections, s, are formed upon the outer surface of the lamp-body in such position as to come into contact with the flange or rim '0 when the collar is inserted, and a like number of corresponding depressions, r, are formed in the under sideof the rim a to receive these projections. When thus constructed, after the collar has once been secured in its place no ordinary force will serve to turn it in its seat. I do not, however, limit myself to the device formed with vthis feature, but only suggest that its employment may, under certain circumstances, prove of considerable advantage.

Letters Patent of the United States No. 264,633, granted to me September 19, 1882, describe a collar substantially the same as my present one, but applied in conjunction with an elastic packing. Such a packing has advantages in many cases, especially with large lamps. The packing tends to relieve the glass from strain during the operation of attaching the collar; but as small lampsare much less liable to fracture than large ones, I do not find I 5 it necessary to use the packing with the former, nor, indeed, do I use it invariably with the latter.

It is both easier and cheaper to apply the collar without than with the packing, and I 2ov therefore dispense with it under most circumstances, especially since, with my machine, before referred to, the breaking of a lampvbody by the act of attaching the collar is scarcely possible.

2 5 I am aware that heretofore bottle-necks have been provided with a close-fitting metal lining extended over the top and down the outside of the neck, whereby the stopper, when inserted, should be in contact with metal, or which,

0 by screw-threading the exterior portion, afforded means for attaching a screw-stopper;

also, that collars having an upper and a lower retaining-flange have been set into the necks of lamp-bodies in the operatlon of molding or blowing the latter; but I am not aware that 3 5 the invention herein described and claimed has ever before been known.

What I claim as new, and desire to secure by Letters Patent, is

1. Thecombination,withthe neckless lamp- 40 body, of the combined collar and neck applied directly thereto, said collar and neck consisting of the screw-threaded tube, the rim,

and the turned flange, all in one piece, substantially as described. 5

2. The combination, withthe neckless lampbody A, provided on its upper surface with one or more small proj ections, s, of the collar B,co1nprising the tube 12, screw-threaded on its interior surface, and rim u, said rim being provided with one or more depressions, 1", to receive the projection or project-ions s, and said tube being inserted through the orifice in the lamp-body, and turned up at its lower end in the form of a flange, t, against the inner surface of the lamp-body, substantially as described.

ARTEMAS LORD DAWSON.

In presence of CHARLES H. FREEMAN, ALONZO HASSON. 

